更换CentOS YUM源为阿里云yum源

# 安装wget（有则不必安装）
yum install wget -y
# 备份
mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup
# 获取阿里云yum源
wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
# 获取阿里云epel源
wget -O /etc/yum.repos.d/epel.repo http://mirrors.aliyun.com/repo/epel-7.repo
# 清理缓存并创建新的缓存
yum clean all && yum makecache
# 系统更新
yum update -y

安装docker

# 安装 Docker CE
# 设置仓库
# 安装所需包
yum install -y yum-utils \
    device-mapper-persistent-data \
    lvm2

# 新增 Docker 仓库,速度慢的可以换阿里云的源。
yum-config-manager \
    --add-repo \
    https://download.docker.com/linux/centos/docker-ce.repo
# 阿里云源地址
# http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo

# 安装 Docker CE.
yum install -y containerd.io-1.2.10 \
    docker-ce-19.03.4 \
    docker-ce-cli-19.03.4

# 启动 Docker 并添加开机启动
systemctl start docker
systemctl enable docker

配置Docker镜像加速

# Setup daemon.
cat > /etc/docker/daemon.json <<EOF
{
    "registry-mirrors":[
        "http://hub-mirror.c.163.com",
        "https://docker.mirrors.ustc.edu.cn",
        "https://registry.docker-cn.com"
    ]
}
EOF

mkdir -p /etc/systemd/system/docker.service.d

# Restart docker.
systemctl daemon-reload
systemctl restart docker